/Engine/Source/Editor/UnrealEd/Classes/ActorFactories/ActorFactory.h
Get the default label that should be used for the actor spawned by the given asset (does not include any numeric suffix). For classes or BPs that inherit fromAActorthis will defer toAActor::GetDefaultActorLabel, and for everything else it will use the asset name.
virtual [FString](API\Runtime\Core\Containers\FString) GetDefaultActorLabel ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * Asset ) const